Power-hammer.



J. E. MORRISON.

POWER HAMMER.

APPLIOATION FILED MAR. 28, 1914.

Patented July 21, 191.4.

Attorneys JOHN ELMER MORRISON, OF ARI/LA, KANSAS.

POWER-HAMMER.

Specification of Letters Patent.

Patented July 21, 1914.

Application filed March 28, 1914. Serial No. 827,916.

To all whom it may concern Be it known that I, Jo-i-IN ELMER MORRI- SON, a citizen of the United States, reslding at Arma, in the county of Crawford and State of Kansas, have invented a new and useful Power-Hammer, of which the following is a specification.

This invention relatesto improvements in power hammers.

An object of the present invention is to provide a power hammer which will be especially adapted to withstand the hard usage to which mechanisms of this class are subjected.

A further object is to provide a power hammer in which the inertia of the moving parts excluding the hammer, is made small by providing few moving parts so arranged that the stress will be properly distributed.

With the foregoing and otherobjects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the drawings accompanying this specification, and forming a part thereof, the preferred embodiment of my invention is illustrated, in which Figure 1 is a front view in elevation of my improved apparatus. Fig. 2 is a side view thereof.

Referring to the drawings in which similar reference numerals designate corresponding parts throughout the several views, 33 represent upright posts between which extend suitable cross struts 1, thus providing a rigid structure upon which is mounted the hammer actuating mechanism. An anvil 5 is supported above the ground by a post 6 or other equivalent means and coacting with which anvil is the hammer head 7 mounted upon the lever 8 which in turn is pivoted at its far end to the upright support 9. The lever 8 and head 7 constitute what is termed the hammer, with the actuation of which my apparatus is particularly concerned. A jack shaft 10 is provided with the drive pulley 11 thereon and with the friction wheel 12 secured thereto. The friction wheel 12 is adapted to drive a similarwheel 13 mounted upon the crank shaft 14, the latter being provided with the offset crank arm 15 whereby a reciprocating motion is obtained A foot treadle 16 is provided and is connected to the bell crank shaped lever 17, the latter moving the friction wheel 12 against or away from the friction wheel 13, thus providing for the control of the crank shaft 14, allowing the motion of the hammer to be intermittent or continuous as hereinafter explained.

Rigidly secured to the forward post 3 are the guide bars 18 which guide the U -shaped carriage 19 in its vertical reciprocating motion. The carriage 19 is provided with the rearwardly extending sleeve members 20 which extend around the guide bars 18 and slidably secure the said carriage thereto. In this connection it is to be noted that although the sleeve member 20 is not depicted in detail, it may be of any preferred construction, provided that it slidably engages the guide bars 18. A link 21 pivotally engages the U-shaped carriage 19 at a central point and is pivotally connected to the crank arm 15. The link 21 is provided with a turn buckle 22 therein whereby the length of the link may be varied as desired.

Pivotally secured to the lower extremities of the downwardly extending legs of the U- shaped carriage 19 are the bell crank-shaped levers 23 to the lower extremities of which, are pivotally secured the links 2 1 which in turn, are pivotally secured to the lever 8, as at 25; A compression spring 26 is secured to the spring carrying member 27 of the U- shaped carriage 19 and which compression spring extends downwardly from the carriage and engages the floating lever 28. The floating lever 28 is linkedly connected at its extremities with the extremities of the bell crank levers 23, as at 29. The links 29 may be lengthened or shortened by means of the nuts 30 which are arranged upon both sides of the said floating lever. The legs 31 of the U-shaped carriage are bifurcated as at 32 in Fig. 2 so that there will be little or no. side strain brought to bear upon the said bell crank levers.

If the foot treadle 16 is pressed clownwarclly the friction wheel 12 will be shifted into engagement with the wheel 13 and forcibly rotate the latter. The U-shaped carriage will be forcibly reciprocated through the intervention of the link 21 and will be held in a horizontal position during such reciprocation by the guides 18. The inertia lag of the hammer and resiliency of the spring 26 will result in quick and sharp blows being imparted to the anvil As the crank arm 15 rotates upwardly, the U-shaped carriage will be so moved, but due to the inertia of the hammer it will lag to such an extent that the crank arm will have started its clownward descent while the hammer is completing its upward stroke. The com aression of the spring 26 will be effected by the downward movement of the U-shaped carriage, producing a multiplied eflect upon the hammer and thus insuring that a quick and forcible blow will be imparted to the anvil.

Having thus fully described the present invention what is claimed is 1. A power hammer comprising a carriage, means for imparting reeiprocatory motion thereto, means for guiding said carriage during such motion, a pair of bell crank levers pivotally secured to the extremities of said carriage, links pivotally secured to the lower extremities of said bell crank levers, a hammer pivotally engaged by said links, a floating lever linkedly connected to the adjacent extremities of the bell crank levers, and a spring extending between the said carriage and lever and normally holding the same apart.

2. A mechanism of the class described, comprising a supporting frame, guides carried thereby, a Ushaped carriage slidably mounted on said guides for reciprocatory motion, a crank shaft rotatably carried by said frame, said crank shaft provided with an offset arm, extensible means connecting said crank shaft and the said reciprocatory carriage, said U-shaped carriage provided with downwardly extending spaced legs, bell crank levers pivotally secured to the said legs, a hammer pivotally mounted above the BEN. F. Ross, FRANK C. HILL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

